# Particle Pro Entity Search

> Particle Pro Entity Search is a paid API for AI agents from api.particle.pro, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Search for people, companies, or knowledge graph entities by free-text query including names, tickers, handles, or domains

## Facts

- Endpoint: GET https://api.particle.pro/v1/entities/search
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/particle-pro-entity-search-a080abc4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lJK9wtG3P4vo-z8e28gYC

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability particle-pro-entity-search-a080abc4
```

Example prompt: Search Particle Pro for the entity 'Sam Altman' — I want to find his canonical profile record, restricted to people results.

## When to prefer this

Use this endpoint when you need to resolve a free-text name, ticker, handle, or domain to a canonical Particle Pro entity record — especially as a first step before calling entity-specific endpoints like Get a Company. Prefer this over the List Entities endpoint when you have a specific search term rather than wanting a full enumeration. Best suited for disambiguation and entity ID resolution workflows.

## Known failure modes

- Empty results when query string doesn't match any indexed entity
- Ambiguous results when a name is shared by multiple entities (requires type filter to narrow)
- Invalid type enum value returns 400 error
- Missing required 'q' query parameter returns 400 error
- Rate limiting or payment failure (x402) if USDC balance is insufficient
- Cursor expiry causing pagination errors on stale cursors

## How this service works

Search entities. Find a person, company, or knowledge graph entity by free-text query — a name, partial name, nickname, stock ticker, @handle, or website domain.

## Output

Returns a paginated list of matching entity records (people, companies, or knowledge graph entities) with canonical IDs, slugs, display names, and entity type metadata. Supports cursor-based pagination for large result sets.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "q"
     ],
     "properties": {
      "q": {
       "type": "string",
       "description": "Free-text query: a name, partial name, nickname, stock ticker, @handle, or website domain (e.g. 'sam altman', 'coca cola', 'AAPL', '@sama', 'apple.com')."
      },
      "type": {
       "enum": [
        "person",
        "company",
        "knowledge_graph_entity"
       ],
       "type": "string",
       "description": "Restrict results to one kind. Omit to search people, companies, and knowledge graph entities together."
      },
      "limit": {
       "type": "integer",
       "format": "int64",
       "description": "Results per page"
      },
      "cursor": {
       "type": "string",
       "description": "Opaque pagination cursor from previous response"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/particle-pro-entity-search-a080abc4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.particle.pro](https://www.zero.xyz/host/api.particle.pro/llms.txt)